University records provided course characteristics, such as the number of students enrolled in each course and the course level (i.e., 100, 200, 300, or 400 level). A 100-level course is typically an introductory course, whereas a 400-level course is typically a more advanced course. Of the 634 courses included in the sample, 24.0% were 100-level, 23.3% were 200-level, 31.7% were 300-level, and 21.0% were 400-level courses.

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